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  • 1. Abrahamsson, Maria
    et al.
    Wolpher, Henriette
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Johansson, Olof
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Larsson, Jan
    Kritikos, Mikael
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, Structural Chemistry.
    Eriksson, Lars
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, Structural Chemistry.
    Norrby, Per-Ola
    Bergquist, Jonas
    Sun, Licheng
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Hammarström, Leif
    A New Strategy for Improvement of Photophysical Properties in Ruthenium(II) Polypyridyl Complexes. Synthesis, Photophysical and Electrochemical characterisation of Six Mononuclear Ruthenium(II) Bisterpyridine Type Complexes2005In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 44, no 9, p. 3215-3225Article in journal (Refereed)
    Abstract [en]

    The synthesis and characterization of six ruthenium(II) bistridentate polypyridyl complexes is described. These were designed on the basis of a new approach to increase the excited-state lifetime of ruthenium(II) bisterpyridine-type complexes. By the use of a bipyridylpyridyl methane ligand in place of terpyridine, the coordination environment of the metal ion becomes nearly octahedral and the rate of deactivation via ligand-field (i.e., metal-centered) states was reduced as shown by temperature-dependent emission lifetime studies. Still, the possibility to make quasi-linear donor−ruthenium−acceptor triads is maintained in the complexes. The most promising complex shows an excited-state lifetime of τ = 15 ns in alcohol solutions at room temperature, which should be compared to a lifetime of τ = 0.25 ns for [Ru(tpy)2]2+. The X-ray structure of the new complex indeed shows a more octahedral geometry than that of [Ru(tpy)2]2+. Most importantly, the high excited-state energy was retained, and thus, so was the potential high reactivity of the excited complex, which has not been the case with previously published strategies based on bistridentate complexes.

  • 2.
    Anderlund, Magnus F.
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Zheng, J.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Ghiladi, M.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Kritikos, Mikael
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
    Rivière, Erik
    Sun, Licheng
    Girerd, Jean-Jaques
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    A New, Dinuclear High Spin Manganese(III) Complex with Bridging Phenoxy and Methoxy Groups. Structure and Magnetic Properties2006In: Inorganic Chemistry Communications, ISSN 1387-7003, E-ISSN 1879-0259, Vol. 9, no 12, p. 1195-1198Article in journal (Refereed)
    Abstract [en]

    A new μ-phenoxy-μ-metoxy di-manganese(III) complex with the trisphenolic ligand, 2,6-bis[((2-hydroxybenzyl)(2-pyridylmethyl)amino)methyl]-4-methylphenol, was isolated as a perchlorate salt. The X-ray structure shows that the two manganese(III) ions are in a distorted octrahedral enviroment with approximately perpendicular Jahn–Teller axes. Investigation of the molar magnetic susceptibility reveals a ferromagnetic coupling between the two high-spin manganese(III) ions. Fitting of the data led to g = 2 and J = 12.5 cm−1

  • 3. Andersson, Samir
    et al.
    Zou, Dapeng
    Zhang, Rong
    Sun, Shiguo
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Selective positioning of CB[8] on two linked viologens and electrochemically driven movement of the host molecule2009In: European Journal of Organic Chemistry, ISSN 1434-193X, E-ISSN 1099-0690, no 8, p. 1163-1172Article in journal (Refereed)
  • 4. Borgström, Magnus
    et al.
    Johansson, Olof
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Lomoth, Reiner
    Berglund-Baudin, Helena
    Wallin, Staffan
    Sun, Licheng
    Åkermark, Björn
    Hammarström, Leif
    Electron Donor-Acceptor Dyads and Triads Based on Tris(bipyridine)ruthenium(II) and Benzoquinone: Synthesis, Characterization, and Photoinduced Electron Transfer Reactions2003In: Inorganic Chemistry, ISSN 0020-1669, Vol. 42, no 17, p. 5173-5184Article in journal (Refereed)
  • 5. Duan, Lele
    et al.
    Bozoglian, Fernando
    Mandal, Sukanta
    Stewart, Beverly
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Privalov, Timofei
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Llobet, Antoni
    Sun, Licheng
    A molecular ruthenium catalyst with water-oxidation activity comparable to that of photosystem II2012In: Nature Chemistry, ISSN 1755-4330, E-ISSN 1755-4349, Vol. 4, no 5, p. 418-423Article in journal (Refereed)
    Abstract [en]

    Across chemical disciplines, an interest in developing artificial water splitting to O-2 and H-2, driven by sunlight, has been motivated by the need for practical and environmentally friendly power generation without the consumption of fossil fuels. The central issue in light-driven water splitting is the efficiency of the water oxidation, which in the best-known catalysts falls short of the desired level by approximately two orders of magnitude. Here, we show that it is possible to close that 'two orders of magnitude' gap with a rationally designed molecular catalyst [Ru(bda)(isoq)(2)] (H(2)bda = 2,2'-bipyridine-6,6'-dicarboxylic acid; isoq = isoquinoline). This speeds up the water oxidation to an unprecedentedly high reaction rate with a turnover frequency of >300 s(-1). This value is, for the first time, moderately comparable with the reaction rate of 100-400 s(-1) of the oxygen-evolving complex of photosystem II in vivo.

  • 6.
    Duan, Lele
    et al.
    Department of Chemistry, Royal Institute of Technology .
    Nyhlén, Jonas
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Fischer, Andreas
    Department of Chemistry, Royal Institute of Technology .
    Xu, Yunhua
    Department of Chemistry, Royal Institute of Technology .
    Privalov, Timofei
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Department of Chemistry, Royal Institute of Technology .
    Highly Active Mononuclear Ru Catalysts for Water Oxidation: O-O Bond Formation via Direct Radical CouplingIn: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126Article in journal (Refereed)
  • 7.
    Ekström, Jesper
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Abrahamsson, Maria
    Olson, Carol
    Bergquist, Jonas
    Kanyak, Feliz B.
    Eriksson, Lars
    Sun, Licheng
    Åkermark, Björn
    Becker, Hans-Christian
    Hammarström, Leif
    Ott, Sascha
    Bio Inspired Side-on Attachment of a Ruthenium Photo-sensitizer to an Iron Hydrogenase Active Site Model2006In: Dalton Transactions, ISSN 1477-9226, no 38, p. 4599-4606Article in journal (Refereed)
  • 8.
    Fryxelius, Jacob
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Eilers, Gerriet
    Feyziyev, Yashar
    Magnuson, Ann
    Sun, Licheng
    Lomoth, Reiner
    Synthesis and redox properties of a [meso-tris(4-nitrophenyl)corrolato]Mn(III) complex2005In: Journal of Porphyrins and Phtalocyanines, Vol. 9, p. 379-386Article in journal (Refereed)
  • 9. Gao, Weiming
    et al.
    Ekström, Jesper
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Liu, Jianhui
    Chen, Changneng
    Eriksson, Lars
    Department of Physical, Inorganic and Structural Chemistry.
    Weng, Linhong
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Binuclear iron-sulfur complexes with bidentate phosphine ligands as active site models of Fe-hydrogenase and their catalytic proton reduction2007In: Inorganic Chemistry, ISSN 0020-1669, Vol. 46, no 6, p. 1981-1991Article in journal (Refereed)
  • 10. Gao, Weiming
    et al.
    Liu, Jianhui
    Jiang, Weina
    Wang, Mei
    Weng, Linhong
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    An azadithiolate bridged Fe2S2 complex as active site model of FeFe-hydrogenase covalently linked to a Re(CO)3(bpy)(py) photosensitizer aiming for light-driven hydrogen production2008In: Comptes Rendus Chimie, ISSN 1631-0748, Vol. 11, no 8, p. 915-921Article in journal (Refereed)
  • 11. Gao, Weiming
    et al.
    Liu, Jianhui
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Bidentate phosphine ligand based Fe2S2-containing macromolecules: synthesis, characterization, and catalytic electrochemical hydrogen production2006In: Inorganic Chemistry, ISSN 0020-1669, Vol. 45, no 23, p. 9169-9171Article in journal (Refereed)
  • 12. Gao, Weiming
    et al.
    Liu, Jianhui
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Facile and highly efficient light-induced PR3/CO ligand exchange: a novel approach to the synthesis of [(mu-SCH2NnPrCH2S)Fe2(CO)4(PR3)2]2007In: Journal of Organometallic Chemistry, ISSN 0022-328X, Vol. 692, p. 1579-1583Article in journal (Refereed)
  • 13.
    Gao, Weiming
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Junliang
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
    Li, Mingrun
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
    Åkermark, Torbjörn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Romare, Kristina
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Royal Institute of Technology (KTH), Department of Organic Chemistry.
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Synthesis of a [3Fe2S] cluster with low redox potential from [2Fe2S] hydrogenase models: electrochemical and photochemical generation of hydrogen2011In: European Journal of Inorganic Chemistry, ISSN 1434-1948, E-ISSN 1099-1948, Vol. 2011, no 7, p. 1100-1105Article in journal (Refereed)
    Abstract [en]

    In the attempted replacement of carbon monoxide by the bis(phosphane) dppv in a dinuclear [2Fe2S] complex, a trinuclear [3Fe2S] complex with two bis(phosphane) ligands was unexpectedly obtained. On protonation, this gave a bridged hydride complex with an unusually low potential for the reduction of protons to molecular hydrogen. The redox potential also appears sufficiently positive for direct electron transfer from an excited [Ru(bpy)(3)](2+) sensitizer.

  • 14.
    Gao, Weiming
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Junliang
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, Structural Chemistry.
    Åkermark, Torbjörn
    Li, Mingrun
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, Structural Chemistry.
    Eriksson, Lars
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, Structural Chemistry.
    Sun, Licheng
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Attachment of a hydrogen-bonding carboxylate side chain to an [FeFe]-hydrogenase model complex: Influence on the catalytic mechanism2010In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 16, no 8, p. 2537-2546Article in journal (Refereed)
    Abstract [en]

    Azapropanedithiolate (adt)-bridged model complexes of [FeFe]-hydrogenase bearing a carboxylic acid functionality have been designed with the aim of decreasing the potential for reduction of protons to hydrogen. Protonation of the bisphosphine complexes 46 has been studied by in situ IR and NMR spectroscopy, which revealed that protonation with triflic acid most likely takes place first at the N-bridge for complex 4 but at the FeFe bond for complexes 5 and 6. Using an excess of acid, the diprotonated species could also be observed, but none of the protonated species was sufficiently stable to be isolated in a pure state. Electrochemical studies have provided an insight into the catalytic mechanisms under strongly acidic conditions, and have also shown that complexes 3 and 6 are electro-active in aqueous solution even in the absence of acid, presumably due to hydrogen bonding. Hydrogen evolution, driven by visible light, has been observed for three-component systems consisting of [Ru(bpy)3]2+, complex 1, 2, or 3, and ascorbic acid in CH3CN/D2O solution by on-line mass spectrometry.

  • 15.
    Gao, Yan
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Liu, Jianhui
    Jiang, Wenfeng
    Xia, Ming
    Zhang, Wei
    Li, Minna
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Synthesis and photophysical and electrochemical properties of a binuclear Ru(bpy)3-Cu(III) corrole complex2007In: Journal of Porphyrins and Phthalocyanines, ISSN 1088-4246, Vol. 11, no 5-6, p. 463-469Article in journal (Refereed)
  • 16. Gao, Yan
    et al.
    Liu, Jianhui
    Na, Yong
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Synthesis and characterization of manganese and copper corrole xanthene complexes as catalysts for water oxidation2007In: Tetrahedron, ISSN 0040-4020, Vol. 63, no 9, p. 1987-1994Article in journal (Refereed)
  • 17.
    Gao, Yan
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Åkermark, Torbjörn
    Liu, Jianhui
    Sun, Licheng
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Nucleophilic attack of hydroxide on a MnV oxo complex: a model of the O-O bond formation in the oxygen evolving complex of photosystem II2009In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 131, no 25, p. 8726-8727Article in journal (Refereed)
  • 18. Ghanem, Raed
    et al.
    Xu, Yunhua
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    pan, Jie
    Hoffmann, Tobias
    Andersson, Johan
    Polivka, Tomas
    Pascher, Torbjörn
    Styring, Stenbjörn
    Sun, Licheng
    Sundström, Villy
    Light-driven Tyrosine Radical Formation in a Ruthenium-Tyrosine Complex Attached to Nanoparticle TiO22002In: Inorganic Chemistry, ISSN 0020-1669, Vol. 41, no 24, p. 6258-6266Article in journal (Refereed)
  • 19. Huang, Ping
    et al.
    Högblom, Joakim
    Anderlund, Magnus F.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Magnuson, Ann
    Styring, Stenbjörn
    Light-indused multistep oxidation of dinuclear manganese complexes for artificial photosyntesis2004In: Journal of Inorganic Biochemistry, ISSN 0162-0134, Vol. 98, no 5, p. 733-745Article in journal (Refereed)
  • 20. Jiang, Shi
    et al.
    Liu, Jianhui
    Shi, Yu
    Wang, Zhen
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Fe-S complexes containing five-membered heterocycles: novel models for the active site of hydrogenases with unusual low reduction potential2007In: Dalton Transactions, ISSN 1477-9226, no 8, p. 896-902Article in journal (Refereed)
  • 21. Jiang, Shi
    et al.
    Liu, Jianhui
    Shi, Yu
    Wang, Zhen
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Preparation, characteristics and crystal structures of novel N-heterocyclic carbene substituted furan- and pyridine-containing azadithiolate Fe-S complexes2007In: Polyhedron, ISSN 0277-5387, Vol. 26, no 7, p. 1499-1504Article in journal (Refereed)
  • 22.
    Johansson, Olof
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Borgström, Magnus
    Lomoth, Reiner
    Palmblad, Magnus
    Bergquist, Jonas
    Hammarström, Leif
    Sun, Licheng
    Åkermark, Björn
    Electron Donor-Acceptor Dyads Based on Ruthenium(II) Bipyridine and Terpyridine Complexes Bound to Naphthalenediimide2003In: Inorganic Chemistry, ISSN 0020-1669, Vol. 42, no 9, p. 2908-2918Article in journal (Refereed)
  • 23. Johansson, Olof
    et al.
    Wolpher, Henriette
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Borgström, Magnus
    Hammarström, Leif
    Bergquist, Jonas
    Sun, Licheng
    Åkermark, Björn
    Intramolecular charge separation in a hydrogen bonded tyrosine-ruthenium(II)-naphtalene diimide triad2004In: Chemical Communications, ISSN 1359-7345, no 2, p. 194-195Article in journal (Refereed)
  • 24.
    Johansson, Olof
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Wolpher, Henriette
    Borgström, Magnus
    Hammarström, Leif
    Bergquist, Jonas
    Sun, Licheng
    Åkermark, Björn
    Intramolecular charge separation in a hydrogen bonded tyrosune-ruthenium(II) baphthalene diimide triad2004In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, p. 194-195Article in journal (Refereed)
  • 25. Li, Chun-Yan
    et al.
    Zhang, Xiao-Bing
    Han, Zhi-Xiang
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Shen, Guo-Li
    Yu, Ru-Qin
    A wide pH range optical sensing system based on a sol-gel encapsulated amino-functionalised corrole2006In: The Analyst, ISSN 0003-2654, Vol. 131, p. 388-393Article in journal (Refereed)
  • 26. Li, Xueqiang
    et al.
    Wang, Mei
    Zhang, Suping
    Pan, Jingxi
    Na, Yong
    Liu, Jianhui
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Noncovalent assembly of a metalloporphyrin and an iron hydrogenase active-site model: photo-induced electron transfer and hydrogen generation2008In: The Journal of Physical Chemistry B, ISSN 1089-5647, Vol. 112, no 27, p. 8198-8202Article in journal (Refereed)
  • 27. Liao, Rong-Zhen
    et al.
    Wang, Mei
    Sun, Licheng
    Siegbahn, Per E. M.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    The mechanism of hydrogen evolution in Cu(bztpen)-catalysed water reduction: a DFT study2015In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 44, no 21, p. 9736-9739Article in journal (Refereed)
    Abstract [en]

    The mechanism of water reduction catalysed by a mononuclear copper complex Cu(bztpen) (bztpen = N-benzyl-N, N', N'-tris(pyridine-2-ylmethyl) ethylenediamine) has been elucidated by DFT calculations, revealing that hydrogen evolution proceeds via coupling of a Cu(II)-hydride and a pendant pyridinium, and providing important implications for the future design of new catalytic systems for water reduction.

  • 28. Lomoth, Reiner
    et al.
    Magnuson, Ann
    Xu, Yunhua
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Mixed-valence Properties of an Acetate-Bridged Dinuclear Ruthenium(II,III) Complex2003In: The Journal of Physical Chemistry A, ISSN 1089-5639, Vol. 107, no 22, p. 4373-4380Article in journal (Refereed)
  • 29. Na, Yong
    et al.
    Wang, Mei
    Pan, Jingxi
    Zhang, Pan
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Visible light-driven electron transfer and hydrogen generation catalyzed by bioinspired [2Fe2S] complexes2008In: Inorganic Chemistry, ISSN 0020-1669, Vol. 47, no 7, p. 2805-2810Article in journal (Refereed)
  • 30.
    Nyhlén, Jonas
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Duan, Lele
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Privalov, Timofei
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Evolution of O2 in a seven-coordinate RuIV dimer complex with a [HOHOH]- bridge: A computational study2010In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 49, no 10, p. 1773-1777Article in journal (Refereed)
  • 31. Pan, Jie
    et al.
    Benkö, Gabor
    Xu, Yunhua
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Pascher, Torbjörn
    Sun, Licheng
    Sundström, Villy
    Polivka, Tomas
    Photoinduced Electron Transfer between a Carotenoid and TiO2 Nanoparticle2002In: Journal of the American Chemical Society, ISSN 0002-7863, Vol. 124, no 46, p. 13949-13957Article in journal (Refereed)
  • 32. Pan, Jingxi
    et al.
    Xu, Yunhua
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Benkö, Gabor
    Feyziyev, Yashar
    Styring, Stenbjörn
    Sun, Licheng
    Åkermark, Björn
    Polivka, Tomas
    Sundström, Villy
    Stepwise Charge Separation from a Ruthenium-Tyrosine Complex to a Nanocrystalline TiO2 Film2004In: The Journal of Physical Chemistry B, ISSN 1089-5647, Vol. 108, no 34, p. 12904-12910Article in journal (Refereed)
  • 33. Pan, Jingxi
    et al.
    Xu, Yunhua
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Sundström, Villy
    Polivka, Tomas
    Carotenoid and Pheophytin on Semiconductor Surface: Self-Assembly and Photoinduced Electron Transfer2004In: Journal of the American Chemical Society, Vol. 126, no 10, p. 3066-3067Article in journal (Refereed)
  • 34. Privalov, Timofei
    et al.
    Sun, Licheng
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Liu, Jianhui
    Gao, Yan
    Wang, Mei
    A computational study of O-O bond formation catalyzed by mono- and bis-MnIV-corrole complexes2007In: Inorganic Chemistry, ISSN 0020-1669, Vol. 46, no 17, p. 7075-7086Article in journal (Refereed)
  • 35.
    Privalov, Timofei
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    The O-O Bonding in Water Oxidation: the Electronic Structure Portrayal of a Concerted Oxygen Atom-Proton Transfer Pathway2011In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 17, no 30, p. 8313-8317Article in journal (Refereed)
  • 36. Schmitt, Heimo
    et al.
    Lomoth, Reiner
    Magnuson, Ann
    Park, Jonathan
    Fryxelius, Jacob
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Kritikos, Mikael
    Mårtensson, Jerker
    Hammarström, Leif
    Sun, Licheng
    Åkermark, Björn
    Synthesis, Redox Properties, and EPR of Manganese(III) Complexes of the Ligand N,N-bis(2-Hydroxybenzyl)-N´-2-hydroxybenzylidene-1,2-diaminoethane: Formation of Mononuclear, Dinuclear, and even Higher Nuclearity Complexes2002In: Chemistry - A European Journal, Vol. 8, no 16, p. 3757-3768Article in journal (Refereed)
  • 37. Sjödin, Martin
    et al.
    Styring, Stenbjörn
    Wolpher, Henriette
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Xu, Yunhua
    Sun, Licheng
    Hammarström, Leif
    Switching the redox mechanism: Models for proton coupled electron transfer from tyrosine and tryptophan2005In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 127, no 11, p. 3855-3863Article in journal (Refereed)
    Abstract [en]

    The coupling of electron and proton transfer is an important controlling factor in radical proteins, such as photosystem II, ribinucleotide reductase, cytochrome oxidases, and DNA photolyase. This was investigated in model complexes in which a tyrosine or tryptophan residue was oxidized by a laser-flash generated trisbipyridine-Ru-III moiety in an intramolecular, proton-coupled electron transfer (PCET) reaction. The PCET was found to proceed in a competition between a stepwise reaction, in which electron transfer is followed by deprotonation of the amino acid radical (ETPT), and a concerted reaction, in which both the electron and proton are transferred in a single reaction step (CEP). Moreover, we found that we could analyze the kinetic data for PCET by Marcus' theory for electron transfer. By altering the solution pH, the strength of the Ru-III oxidant, or the identity of the amino acid, we could induce a switch between the two mechanisms and obtain quantitative data for the parameters that control which one will dominate. The characteristic pH-dependence of the CEP rate (M. Sjodin et al. J. Am. Chem. Soc. 2000, 122, 3932) reflects the pH-dependence of the driving force caused by proton release to the bulk. For the pH-independent ETPT on the other hand, the driving force of the rate-determining ET step is pH-independent and smaller. On the other hand, temperature-dependent data showed that the reorganization energy was higher for CEP, while the pre-exponential factors showed no significant difference between the mechanisms. Thus, the opposing effect of the differences in driving force and reorganization energy determines which of the mechanisms will dominate. Our results show that a concerted mechanism is in general quite likely and provides a low-barrier reaction pathway for weakly exoergonic reactions. In addition, the kinetic isotope effect was much higher for CEP (k(H)/k(D) > 10) than for ETPT (k(H)/k(D) = 2), consistent with significant changes along the proton reaction coordinate in the rate-determining step of CEP.

  • 38. Sun, Shiguo
    et al.
    Zhang, Rong
    Andersson, Samir
    Pan, Jingxi
    Zou, Dapeng
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Host-guest chemistry and light driven molecular lock of Ru(bpy)3-viologen with cucurbit[7-8]urils2007In: The Journal of Physical Chemistry B, ISSN 1520-6106, Vol. 111, no 47, p. 13357-13363Article in journal (Refereed)
  • 39. Tong, Lianpeng
    et al.
    Duan, Lele
    Xu, Yunhua
    Privalov, Timofei
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Structural Modifications of Mononuclear Ruthenium Complexes: A Combined Experimental and Theoretical Study on the Kinetics of Ruthenium-Catalyzed Water Oxidation2011In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 50, no 2, p. 445-449Article in journal (Refereed)
  • 40.
    Tran, Lien-Hoa
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Eriksson, Lars
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry, department of Structural Chemistry.
    Sun, Licheng
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    A New Square Planar Mn(III) Complex for Catalytic Epoxidation of Stilbene2008In: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 693, p. 1150-1153Article in journal (Refereed)
  • 41.
    Tran, Lien-Hoa
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Eriksson, Lars
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
    Sun, Licheng
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    A new square planar mononuclear MnIII complex for catalytic epoxidation of stilbene2008In: Journal of Organometallic Chemistry, ISSN 0022-328X, Vol. 693, no 6, p. 1150-1153Article in journal (Refereed)
  • 42. Wang, Lei
    et al.
    Duan, Lele
    Stewart, Beverly
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Pu, Maoping
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Liu, Jianhui
    Privalov, Timofei
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Toward Controlling Water Oxidation Catalysis: Tunable Activity of Ruthenium Complexes with Axial Imidazole/DMSO Ligands2012In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 134, no 45, p. 18868-18880Article in journal (Refereed)
    Abstract [en]

    Using the combinations of imidazole and dimethyl :sulfoxide (DMSO) as axial ligands and 2,2'-bipyridine-6,6'-dicarboxylate (bda) as the equatorial ligand, we have synthesized six novel ruthenium complexes with noticeably different activity as water oxidation catalysts (WOCs). In four C-s symmetric Ru-II(kappa(3)-bda)(DMSO)L-2 complexes L = imidazole (1), N-methylimidazole (2), 5-methylimidazole (3), and 5-bromo-N-methylimidazole (4). Additionally, in two C-2v symmetric Ru-II(kappa(4)-bda)L-2 complexes L = 5-nitroimidazole (5) and 5-bromo-N-methylimidazole (6), that is, fully equivalent axial imidazoles. A detailed characterization of all complexes and the mechanistic investigation of the catalytic water oxidation have been carried out with a number of experimental techniques, that is, kinetics, electrochemistry and high resolution mass spectrometry (HR-MS), and density functional theory (DFT) calculations. We have observed the in situ formation: of a Ru-II-complex with the accessible seventh coordination position. The measured catalytic activities and kinetics of complex 1-6 revealed details about an important structure activity relation: the connection between the nature of axial ligands in the combination and either the increase or decrease of the catalytic activity. In particular, an axial DMSO group substantially increases the turnover frequency of WOCs reported in article, with the ruthenium-complex having one axial 5-bromo-N-methylimidazole and one axial DMSO: (4), we have obtained a high initial turnover frequency of similar to 180 s(-1). DFT modeling Of the binuclear reaction pathway of the O-O bond formation in catalytic Water oxidation further corroborated the concept of the mechanistic significance of the axial ligands and rationalized the experimentally observed difference in the activity of complexes with imidazole/DMSO and imidazole/imidazole combinations of axial ligands.

  • 43. Wang, Zhen
    et al.
    Jiang, Wenfeng
    Liu, Jianhui
    Jiang, Weina
    Wang, Yu
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Pendant bases as proton transfer relays in diiron dithiolate complexes inspired by [Fe-Fe] hydrogenase active site2008In: Journal of Organometallic Chemistry, ISSN 0022-328X, Vol. 693, no 17, p. 2828-2834Article in journal (Refereed)
  • 44. Wang, Zhen
    et al.
    Liu, Jianhui
    He, Chengjiang
    Jiang, Shi
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Diiron azadithiolates with hydrophilic phosphatriazaadamantane ligand as iron-only hydrogenase active site models: Synthesis, structure, and electrochemical study2007In: Inorganica Chimica Acta, ISSN 0020-1693, E-ISSN 1873-3255, Vol. 360, no 7, p. 2411-2419Article in journal (Refereed)
    Abstract [en]

    Three novel complexes (mu-adt)[Fe-2(CO)(5)PTA] (2-PTA), (mu-adt)[Fe-2(CO)(4)PTA(2)](2-PTA(2)) and (mu-adt)[Fe-2(CO)(5)DAPTA] (2-DAPTA), where adt is SCH2N(CH2CH2CH3)CH2S, PTA stands for 1,3,5-triaza-7-phosphaadamantane and DAPTA is 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane, were prepared as the models of the iron hydrogenase active site through controlled CO displacement of (mu-adt)[Fe-2(CO)(6)] with PTA and DAPTA. The coordination configurations of 2-PTA and 2-PTA(2) were characterized by X-ray crystallography. The disubstituted diiron complex 2-PTA(2) features a basal/apical coordination mode, instead of the typical transoid basal/basal configuration. Protonation of three complexes only occurred at the bridging-N atom, rather than at the tertiary nitrogen atom on the PTA or DAPTA ligands. Electrochemical properties of the complexes were studied in acetonitrile or a mixture of acetonitrile and water in the presence of acetic acid, by cyclic voltammetry. The current sensitivity of the reduced species to acid concentration in the presence of H2O is greater than in the pure CH3CN solution.

  • 45.
    Wolpher, Henriette
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Borgström, Magnus
    Hammarström, Leif
    Bergquist, Jonas
    Sundström, Villy
    Styring, Stenbjörn
    Sun, Licheng
    Åkermark, Björn
    Synthesis and Properties of an Iron Hydrogenase Active Site Model Linked to Ruthenium tris-Bipyridine Photosensitizer2003In: Inorganic Chemical Communications, Vol. 6, p. 989-991Article in journal (Refereed)
  • 46. Wolpher, Henriette
    et al.
    Johansson, Olof
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Abrahamsson, Maria
    Kritikos, Mikael
    Sun, Licheng
    Åkermark, Björn
    A tridentate ligand for preparation of bisterpyridine-like ruthenium(II) complexes with an increased excited state lifetime2004In: Inorganic Chemistry Communications, ISSN 1387-7003, Vol. 7, no 3, p. 337-340Article in journal (Refereed)
  • 47.
    Wolpher, Henriette
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Johansson, Olof
    Abrahamsson, Maria
    Kritikos, Mikael
    Sun, Licheng
    Åkermark, Björn
    A tridentate ligand for preparation of bisterpyridine-like ruthenium(II) complexes with an increased excited state lifetime2004In: Inorganic Chemistry Communications, ISSN 1387-7003, Vol. 7, no 3, p. 337-340Article in journal (Refereed)
  • 48.
    Wolpher, Henriette
    et al.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sinha, Subrata
    Pan, Jingxi
    Johansson, Anh
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Lundqvist, Maria J.
    Persson, Petter
    Lomoth, Reiner
    Bergquist, Jonas
    Sun, Licheng
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sundström, Villy
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Polívka, Tomás
    Synthesis and electron transfer studies of ruthenium-terpyridine-based dyads attached to nanostructured TiO22007In: Inorganic Chemistry, ISSN 0020-1669, Vol. 46, no 3, p. 638-651Article in journal (Refereed)
  • 49. Xia, Ming
    et al.
    Liu, Jianhui
    Gao, Yan
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Synthesis and photophysical and electrochemical study of tyrosine covalently linked to high-valent copper(III) and manganese(IV) complexes2007In: Helvetica Chimica Acta, ISSN 0018-019X, Vol. 90, no 3, p. 553-561Article in journal (Refereed)
  • 50. Xu, Yunhua
    et al.
    Duan, Lele
    Tong, Lianpeng
    Åkermark, Björn
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Sun, Licheng
    Visible light-driven water oxidation catalyzed by a highly efficient dinuclear ruthenium complex2010In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 46, no 35, p. 6506-6508Article in journal (Refereed)
12 1 - 50 of 54
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